Where do I enter my total sales for 2018?

[Anita01]

Under the Schedule  interview (Enter the words Schedule C in Search, then click the Jump To..  If you have 1099-MISC forms reporting your sales, you can enter them first.  After the 1099-MISC, or if you say you have no 1099-MISC forms, you are asked for income not reported on  1099-MISC.